4. A person who was slightly dehydrated went to donate blood, but they forgot that they...

4. A person who was slightly dehydrated went to donate blood, but they forgot that they had to go home to feed their mini dinosaur (if you don't feed them regularly, they get really mean), so instead of waiting in the recovery chair, this silly person stood up quickly and walked out the door. As they stood up, they felt dizzy and light headed and almost passed out. a. This person suffered from a quick decrease in MAP, DRAW the negative feedback loop that was activated by this decrease in MAP and the organs responsible for keeping this person from actually passing out

b. Choose one arrow in your drawing and explain why the first box causes the next box.

Expert Solution

Renin - When there is low Blood pressure or decrease in MAP mean arterial pressure then Renin is released .
Renin convert Angiotensinogen To Angiotensin 1 and further to Angiotensin 2 through ACE angiotensin converting enzyme. Angiotensin 2 act on AT receptor 1 and 2 and cause vasoconstriction . Also it increase the release of Aldosterone from adrenal cortex.
Aldosterone cause sodium and water retention and potassium excretion.AT 2 cause vasoconstriction so decreased GFR and further activation of RAAS and more and more sodium and water rebasorptiom occur and increase in blood volume and increase in blood pressure .

Sydney Mullin answered 1 year ago

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